The Hayward EC-50 Filter System is a state of the art diatomaceous earth system that offers high performance filtration up to 3,000 gallons per hour. As you would expect from such a reputable company, the Hayward EC-50 DE filter system is manufactured from only the most durable materials that are corrosion-proof and designed to withstand continuous operation. Efficient filtration of even the smallest particles. Provides crystal clear water for your above ground pool. Features the powerful Flex-Tube design combined with DE filter powder H_A_F No backwashing Easy assembly. Fast cleaning. Unique bump handle automatically purges dirt and debris. Automatically removes air from the system.